I asked this question before. Hope these help.

http://www.kixtart.org/ubbthreads/showflat.php?Cat=&Board=UBB1&Number=141277

http://www.kixtart.org/ubbthreads/showflat.php?Cat=0&Number=143844&an=0&page=0#143844
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let the wise listen and add to their learning,
and let the discerning get guidance- Proverbs 1:5